Borealis Technology Oy

Esa Kinnunen

Kalle Kallio

Hilkka R Knuuttila

Harri Hokkanen

Ole Jan Myhre

Merete Skar

Marja Ora

Arja Lehtinen

Eija Lappi

Anneli Malmberg

This invention concerns process for producing polyethylene compositions, films prepared thereof and process for the preparation of the films. The process comprises subjecting ethylene, optionally hydrogen and comonomers to polymerization or copolymerization reactions in a multistage polymerization. At least one polymerization stage is conducted essentially in the absence of hydrogen. The polymerization reactions are carried out in the presence of a single-site catalyst capable of forming a composition comprising a low molecular weight component with MFR of at least 10 g/10 min and a density higher than the density of the composition and a high molecular weight component. The melt flow rate of the composition is in the range MFR &equals;0.1-5.0 g/10 min and the density of the composition is 915-960 kg/m . The invention makes it possible to produce polyethylene compositions for manufacturing films with a good balance between optical and mechanical properties.

Polymer composition, a process for the production thereof and films prepared thereof

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Porvoo, Finland

Esa Kinnunen